Hydraulic press



MaylZ, 1936. 1 A. MOLIN I HYDRAULIC PRESS Filed Sept. 22, 1953 3Sheets-Sheet 1 May 12,- 1936. l.. A. MoLlN HYDRAULIC PRESS 3'Sheets-Sheet 2 Filed sept. 22, 1935 May 12, 1936. 1 A. MoLlN 2,040,394

HYDRAULIC PRESS Filed sept. 22, 1933 3 sheets-Sheet 3 Patented May 12,1936 UNITED STATES PATENTv OFFICE HYDRAULIC PRESS Y Louis A. Molin,Chicago, Ill. Application September 22, 1933, Serial No. 690,524

13 Claims.

My invention relates to an hydraulic press and more particularly to amechanism of this character which is utilized for the extraction of oilsand greases from oil-bearing seeds, animal tis,-

.5 sues for crackling, and other oil-bearing materials whose oil contentmay be substantially removed by the application of pressure, with orwithout the addition of heat.

Present methods of commercially extracting oil or grease from the abovematerials generally comprehend the use of an hydraulic press which ismanually charged with the oil-bearing material that is segregated intoindividual masses by the interposition of spaced metal plates -or otherforms of separating devices in order to better apply the pressure to thetotal mass of a charge.

The pressure chamber is generally cylindrical in form so thatconsiderable time is required for the oil which is extracted from thecentral portions 2o 0f lthe several masses to seep radially fordischarge through the apertures of the pressure chamber wall. Moreover,a machine of this type must not only be manually charged, but alsounloaded inthe same way, the plates forming a plurality of compressedcakes which are discharged singly through the head of the cylinder bythe pressure ram.

Another type of extracting mechanism takes the form of the so-calledextrusion press which '30 provides for the continuous extraction of oilfrom oil-bearing material that is moved under a constant pressurethrough the machine, the pressure also acting to discharge the residue.According to this method, it is contemplated that, when any given unitof the material has reached the discharge end of the machine, themaximum 'amount of oil content will have been extracted. In practice,however, it has been found that, not only is a very inferior grade ofoil produced by l0 this machine, but a rather large quantity of oil isleft in the residue, so that this type of press yis characterized byrelatively low e'iciency.

It is therefore one of the objects of my invention to devise anoil-extracting lpress that is loaded and unloaded automatically, and inwhich the maximum pressure possible is applied to the material for asubstantial period of time, as vdetermined by the characteristics of thematerial being compressed, to thereby secure a maximum yield of oil orgrease.

,A further object is to provide a press of the character indicatedemploying a pair of concentric curb cylinders between which the materialis squeezed by suitable members operating in the annular space betweenthe cylinders, the liquid inner curb and a spaced, surrounding outervcurb v which together form a material-receiving chamber that isprovided at one end with a tamping or pre-pressing ring and at theopposite end With a principal ram, the tamping ring acting to fullycharge the chamber and initially extract a portion of the oil from thematerial, while the principal ram moves in a direction opposite to thatof the tamping ring to complete the extracting process, this arrangementresulting in certain economies in the over-all length of the press owingto the necessity for moving the principal ram only a relatively shortdistance.

A further object is to devise a press having the foregoing inner andouter curb construction wherein the principal ram is formed as a part ofthe inner curb and provision is made for heating the interior of theinner curb to establish the proper squeezing temperature.

A further object is to Vprovide a press having the characteristics notedabove in which the curb is free to move with the ram during the pressingoperation to thereby substantially eliminate f-riction between thematerial and the outer curb, as would otherwise occur i1" the curb wasfixed in position and the ram was required to move the entire chargerelative to the curb, the outer curb being additionally held at the endof itsV movement during compression to permit the separate return of theram to initial position, thus providing a discharge opening between theouter curb and ram through which the material expelled by the tampingring.

A further object is to devise4 a press substantially as set forth abovein which the tamping ring and principal ram are hydraulically actuatedand in connection with which, owing to the relatively short stroke ofthe ram, it is possible to use a rather small quantity of hydrauliclluid and a smaller and less expensive pump `installa-- tion, withconsequent lower operating cost.

A further object is to devise a hydraulic press having a pair ofconcentric curbs, one Yof which is provided with a number of radiallyextending iins which divide the annular compression space into aplurality of smaller chambersfthusincreasing the area of hard, metallicpressing surface and lowering the time required for pressing any givenquantity of material.

In the drawings:

Figure 1 is an elevation, partly in section, of

`my improved press, Vthe several parts being the spaced relation of theconcentric curbs, the

knife blocks whichV assist in splitting the compressed cake during thedischarge, and the chute into which the broken cake is delivered.

FigA is an elevation of a portion of the press, partly in section, asillustrated in Fig. 1, showing thetamping ring in the act of tamping orprepressing an initial charge of the loosely-packed material in the curbchamber, and-further show- Y ing that this movement of the ring serves,in

conjunction with the inner curb, to close off temporarily the mainsupply of oil-bearing material. Fig. 5 is a view similarto Fig. 4, butshowing .the tamping ring retracted to its uppermost positionandtheramapplying final compression to the material in the chamber, the innercurb alsorcoacting with the tamping ring to isolate the materialsupplied. Y

Fig., 6r is a, View, generally similar to Figs. 4 and 5, butillustrating the nal or residue discharging step in the. operation ofthe press, the outer curb being held in the raised position shown inFig. 5,` and the inner curb and associ- Vated ram being moved downwardlyby the tamping ring to a position below the lower end of the outer curbto thus provide a discharge opening through which theY compressed cakeis discharged.v

Fig. 7 is an elevation, partlyin section, show- .ing a modified curbconstruction wherein a number of spaced, radial fins are. located in thematerial-receiving chamber between the concentric ycurbs to therebyincrease the area of the hard surface available for compression.

Fig; 8V isV a section along the line 8-8 in Fig. 7, looking in thedirection of the arrows, and showing the spacing of the radial fins andthe severalisolated chambers formed thereby.

The specific embodiment of my invention, as

Jset forth in the present application, relates to a press Vfor theextraction of greases from animal tissues or cracklings. The material isfed to the chamber between the curbs by gravity and provision ismade forautomatically interrupting this supply by the same or associatedelements which effect the tamping and compression of Athe material. Itwill be understood, however,

.that, notwithstandingV the specific disclosure of rests a pair of nutsI3 that are mounted upon the lower ends of a pair of tie rods I4 whichextend upwardly through the adjacent ends of a lower header I5. In planView, the header I5 possesses the generallyV rectangular shape aS shownin Fig. 2 and a tie rod I4 is located ad.- jacent each corner thereof.These rods project upwardly through an upper header I6 and receive ontheir upper extremities nuts II, similar to the nuts I3. The header i6possesses a marginal outline conforming torthat of the header I5 andeach of the headers are maintained inV abutting relation to theirassociated nutsby means of clamping collars I8. The headers and tie rodsconstitute a box-like structure which forms the principal framing of thepress and the entire weight of which is carried onthe girders I2.

Preferably integrally formed with the header I5 is a hydraulic cylinderI9 that extends` downwardly in the pocket I I and has detachablyYinqunted therein a piston 2B. such as oil and the like, is introducedinto the cylinder I9 by means of a pipe 2| that may be in communicationwith a remote pumping mechanism.

The piston 26 is formed as an annular shell whose lower end is closedand on the upper end of which rests a ram 22v having an annular portion23 which fits within the piston 26 and is locked thereto by means of alset screw 24. Accordingly, when fluid is introduced into the cylinder I9, the piston and ram 22 move together as a unit.

Except for certain passages hereinafter de- Actuating fluid,

scribed, the top surfaceof the ram 22 is closed f and resting thereonisan inner curbV 25 composed of a plurality of axially spaced rings 26which are externally connected by means ofV longitudinally extendingbars 2'I. As shown clearly in Figs. 1 and 3, these bars are arranged inthe manner of barrel staves, but are spaced circumorder to avoid anyblindy spots along the barsV 2'I where contacted by the rings 26. Theupper ends ofthe bars 21 have rested thereon a frustoconical cover 3l)which closes the upper end of the inner curb and which is suitablyapertured to receive the inlet andrexhaust pipes 3| and 32,

respectivelyof a steam heating coil 33 that is located within the innercurb. The pipes 3| and 32 extend upwardly through a supply or feed pipe,hereinafter described, which delivers the material to the press.

As indicated in Figs. 1 and 3, the pressing surface 34 of the ram 22 isinclined downwardly and outwardly from the lower ends of the inner curbbars 21 and this surface is preferably provided with several knifeblocks 35 which coact with certain parts hereinafter described to more.effectively break up the residue cake during the discharge thereof fromthe press, four of such blocks being shown.

An outer curb 36 encircles the ram 22 in spaced vrelation to the innercurb and is composed of a plurality of axially spaced rings 31 whichvare internally connected by means of longitudinally extending bars 38.As in thecase of the inner curb, the bars 38 are spaced from each otherto form openings 39 therebetween and are arranged after the generalmanner of barrel staves.v

-The spacing of the inner and outer curbs froms a material-receivingchamber 40 "within which the material is compressed and an oil rpan 4I,located adjacent the lower end of the'outer curb, is utilized to receivethe oil squeezed from the material. For a purpose presently explained,the oil pan 4I is preferably formed of two separable parts. One of theseparts is an annular ring 42 having the substantially L-shaped crosssection shown in Fig 1, the upstanding limb of this ring being outwardlydisposed in order to properly retain the collected oil. The oil in thisring is maintained above the congealing point in order to facilitate itshandling through having an internal passage 43 which, on one side of thering is in communication with the flexible steam inlet hose 44 and on.the oppositel side with a corresponding hose 45 through which the steamis exhausted from the ring. The inner face `of the ring 42 is tapered asat 46 and coacts with an oil seal ring 41 which constitutes the secondpart of the oil pan. The face 46 tapers upwardly toward the top of thepress and the ring 41 is normally maintained in engagement therewith bymeans of a plurality of coil springs 48 that contact the underside ofthe seal ring and are located in appropriate pockets 49 provided in thecylinder I9. The seal ring 41 encircles the ram 22 and an annular flange50 projects upwardly from the inner side of the ring and fits within asuitable annular slot provided in a shoulder I which is undercut in theram 22. A plurality of passages 52 are provided in the ram 22 and thesepassages lead from the interior of the inner curb 25 and terminate atthe outwardly inclined, upper surface 53 of the ring 41. Accordingly,any oils which are squeezed through the inner curb pass outwardlythrough these passages 52 and, when the ram 22 is separated from theseal ring 41 in the manner hereinafter explained, the indicated oil mayflow into the oil pan 4| and from thence may be evacuated through asuitable flexible hose 54. As clearly shown in Fig. 1, the oil panportion 42 is rigidly connected to and moved with the outer curb bymeans of cap screws 55.

In order to provide for the free movement of the outer curb along therods I4 for a purpose presently explained, arcuate shoes 56 are attachedto the upper curb ring 31 and also to the pan ring 42. The .curb 36 istherefore free to move upwardly from the position shown in Fig. 1, butmovement downwardly is restricted by a plurality of clamping collars 51,one for each of the rods I4.

A supply tube 58 is slidably mounted in the upper header I6 in axialalignment with the inner curb and through this tube is delivered the oilbearing material to the compression chamber 40 located between theconcentric curbs. The lower end of the tube 58 projects below the upperheader I6 and has attached thereto a tamping ring 59 whose dimensionsare such that it fits closely in the annular, material-receiving chamber40.

The tamping` ring 59 is hydraulically actuated by means of piston rods60 which project upwardly through the header I6 into cylinders '6Imount- 'ed on the upper side of the header. 'Iv'wo such rods are shownin the drawings, but this number may be varied as desired. A piston 62is fastened on the upper extremity of each piston rod 60 and -thispiston is of the double-acting variety. Actuating fluid is introducedinto the cylinders 6l above the pistons 62 by pipes 63 to thereby movethe tamping ring 59 downwardly from the position shown in Fig. 1, whilethe reverse movement of the ring is effected by the delivery of iiuidinto the cylinders 6I below the pistons 62 through pipes 64, it beingunderstood that the pipes 63 and 64 are in communication with a suitablepump mechanism.

Another pair of cylinders 65 is also provided on the upper header I6Yand within each of the cylinders operates a piston 66 having a pistonrod 61 whose lower end is provided with an arm 68 which engages with'the underside of an upper ring 31 on the outer curb. At an appropriatetime in the operation of the press, as hereinafter explained, actuatingfluid is introduced into the cylinders 65 below the pistons throughpipes 69 to hold the outer curb in its raised position.

A pair of oppositely extending chutes are carried by the lower header l5and are so disposed with reference to the lower end of the compressionchamber 40 that, when the ram 22 is moved downwardly'upon the completionof the pressing operation to provide a discharge opening for theresidue, the latter will 'fall directly on the chute on opposite sidesof the press forsubsequent transfer to containers, belt conveyors, orthe like.

In describing the operation of my improved press, reference will be hadmore particularly to Fig. 1 and Figs. 4 to 6, inclusive. Referring irstto Fig. 1, it will be understood that the supply pipe 58 communicateswith some form of bin or reservoir, or other supplying arrangement, sothat the oil bearing material flows by gravity downwardly through thepipe. As shown in Fig. l, the tamping ring 59 is in a fully retractedposition, while the ram 22 is at the lowermost point of its stroke and,in this position, closes the lower end of the chamber 40. Moreover, inthis position of the ram, the conical cover 30 is so disposed withreference to the 'tamping ring 59 that the material may freely flow tothe chamber 46.

This flow continues until the chamber becomes -loosely packed with theoil bearing material, whereupon the tamping ring 59 is actuateddownwardly into the position substantially shown in Fig. 4 to therebymore completely pack the initial charge of material in the chamber andalso exert some compressionv on the material which may be suiicient toextract some oil therefrom.

The tamping ring is thereupon retracted to the position shown in Fig. 1,thus permitting a fresh charge of material to be delivered into thecharnber above the compact mass already resting on the ram, whereuponthe tamping ring is again moved downwardly to compress the vsecondcharge of the material. vThis operation is repeated until the curb iscompletely charged with a fairly compacted mass of the oil bearingmaterial, that is, until the curb has acquired such a charge that, whensubmitted to the high pressure of the ram, efficient results from thestandpoint of production will be obtained. During this entire operation,as well as during all subsequent operations of the press, it will beunderstood that steam or some other heating medium is continuallypassing through the heating coil 33, so that the oil in its passageoutwardly and inwardly through both curbs is never given an opportunityto con- 'geaL Steam is also constantly passing through the steam spacein the oil pan, so that grease which is collected therein is alwaysmaintained in a fluid condition..

Upon the completion of the. nal tamping operation, thedownwardly-acting, ,hydraulic'pressure on the tamping ring is relievedand fluid under pressure is introduced into the cylinder I9 to therebycause an actuation of the ram 22 upwardly(` The outer curb, owing to itssubstantially iloating mounting on the tie rods I4, moves upwardly withthe ram during the initial phases 1 Vof the latters movement and thisupward moveis substantially cut in half'.

ment of the ram also causes an upward movement of theV tamping ringuntil the latter abuts against the underside of the upper header I 6,which thereafter resists the pressure created by the ram, so that theupper thrust of the ram is taken substantially by the principal frame ofthe machine. The squeezing ofY the material in the chamber 40 causes alateral seepage or emission of the oil from the cracklings through theopenings in both curbs, that is, the oil flows in oppositedirectionsthrough the walls of the inner and outer curbs, so that, compared to asingle curb construction, the distance traversed by the oil before itbecomes free from the compressed cake Accordingly, the time requiredforthe pressingroperation is considerably reduced and the percentage ofoil obtained from any given quantity of material is increased. VThe oilthat is squeezed through the walls of the outer curb flows directly intothe oil pan, while that; squeezed through the inner curb reaches the panthrough the passages 52.

The nnal step of the squeezing operation is illustrated generally inFig. 5 and it will be particularly not-ed that the ram has becomeseparated from the sealing ring 41, thereby uncovering the delivery endsof the passages 52 and permitting thefree ow ofthe oil from the innercurb into the oil pan. During the upward movement of the outer curb,contact of the sealing ring,

however, the curb and the ram substantially move together during theinitial stages of'the compression and there is Vonly a relatively slightmovement of the-.raml with respect to the curbV in completing thenalpressing operation.

Upon the completion of the main pressing operation, fluid is introducedinto the cylindersl 65 below the piston 66 for the purpose oftemporarily restraining any tendency of the outer curb to movedownwardly. At Vthe same time, pressure in the cylinder I9 is relievedand iluid under pressure is introduced into the cylinders 6| above theUpon; the completion' ofY the discharge, the tamping ring is'retractedupwardly by hydraulic pressure and rthe pressure in the cylinders 65 isrelieved'to'permit a dropping of the outer curb to the position shown'inFig. 1, whereupon the4 Vfresh material in the supply pipe is -again freestandpoint of 'efciently handling the o-il or grease bearing material.In the first place, the press is loaded and unloaded automatically,without any necessity for manual labor of any character, other than anoperator to control the admission of pressure to the several hydraulicpumps. The tamping and pre-pressing movements of the tamping ring insurethat the curb will be loaded to its maximum capacity for each cycle ofoperation, so that the press operates at maximum efciency at all times,regardless of the native, loose nature of the material. The steam coilwithin the inner curb is so disposed as to continuously applyrheat tothe charge in the chamber which is suiciently hot to maintain theemitted grease in a fluid condition and of insuring that the grease willcontinue to ow freely until it has been discharged to the openings inboth walls of the curb. Owing to the concentric disposition of wardly ofthe material so that my improved construction provides for a minimum oftravel on the part of the emitted oil and thus reduces the time duringwhich it is necessary to maintain pressure on the ram. This annularpressing space also enables a higher unit pressure to be applied to thecracklings, compared to the unit pressure obtaining inthe ram cylinder,because of the diierence in the area to which the former pressure isapplied.

In Figs. 7 and 8 is illustrated a modied type of press which isidentical with that just described except in the particulars which willnow be described. The inner curb 12, corresponding -to the inner curb25, is provided with a plurality Yof fins 13 which radiate outwardly andextend from the squeezing face of the ram upwardly in the compressionchamber 14, but terminate at some distance from the upper end of theinner `curb 12. These fins arerspaced from each other circumferentiallyof the linner curb and each pair defines a compression chamber 15.` VByusing the fins 13, it is possible to materially increase the area` ofthe hard surface which sub- :jects the material to compression. Thisconstruction, therefore, makes for greater efficiency because, for anygiven rampressure, it is possible to extract a greaterpercentage of theoil contained in the cake.V Y

In the operation of this press, it will be understood that thepre-pressing movements of the tamping ring 16 terminate short of theupper ends of the fins-13Y and that, during the discharging step of theprocess, corresponding to a relation of mally closing the lower' end ofand movable to compress the material'in the chamber, said ram beingundercut to provide a shoulder and having passages extending from theinterior of the Vinner curb to the face of the shoulder for dischargingliquid squeezed through the inner curb, a collecting pan adjacent thelower end of the outer curb and extending inwardly to include thedelivery ends of the passages, and a member operating as an abutment forthe compressing movement of the' ram.

2. An hydraulic press rcomprising in combination, curb guides, an innercurb, an outer curb spaced from and surrounding the inner curb andslidably mounted on the guides for movement relative to the inner curb,a ram formed as a part of the inner curb and movable to compress thematerial between the curbs, the outer curb moving with the ram duringthe initial stage of the compression of the material and the ram havingpassages for discharging outwardly of the outer curb liquid squeezedVthrough. the inner curb, and a member operating as an abutment for thecompressing movement of the ram.

3. An hydraulic press of the vertical type comprising in combination,curb guides, an inner curb, an outer curb spaced from and surroundingthe inner curb to form a material-receiving chamber and slidably mountedon the guides, a ram normally closing the lower end of and movable tocompress the material in the chamber, the outer curb moving with the ramduring the compression of the material and the ram being undercut toprovide a shoulder and having passages extending from the interior ofthe inner curb to' the face of the shoulder for discharging liquidsqueezed through the inner curb, a collecting pan composed o1' twoseparable parts, one part surrounding the lower end of the outer curband the other part registering with the delivery ends of the passages atthe beginning of the compression movement of the ram and subsequentlyseparating from the shoulder, a member operating as an abutment for thecompressing movement of the ram, means for holding the outer curb in itsuppermost position upon the completion of compression, and means formoving the abutment member downwardly to thereby return the ram and thepart of the pan engaged thereby to initial position, and todischarge theresidue cake between the ram and outer curb.

4. An hydraulic press of the vertical type comprising in combination,curb guides, an inner curb, an outer curb spaced from and surroundingthe inner curb to form a material-receiving chamber and slidably mountedon the guides, a tamping member and a ram located adjacent the oppositeends of the chamber, respectively, means for actuating the member andram in opposite directions at different times to fully charge andcompress the material in the chamber, respectively, the outer curbmoving with the ram during the early stages of compression and the rambeing undercut to provide a shoulder having passages extending from theinterior of the inner' curb to the face of the shoulder for dischargingliquid squeezed Y through the inner curb, a collecting pan combeingthereupon moved downwardly to return the ram and the part of the panengaged thereby to initial position, and to discharge the residue cakebetween the ram and outer curb.

5. An hydraulic press comprising in Vcombination, curb guides, an innercurb, an outer curb spaced from and surrounding the inner curb'to form amaterial-receiving chamber andslidably mounted on the guides, aplurality of spaced plates extending lengthwise from one end of thechamber and terminating short of the opposite end, a tamping member anda ram located adjacent the opposite ends of the chamber, respectively,means for actuating the member and ram in opposite directions atdifferent times to fully charge and compress the material in thechamber, respectively, the outer curb moving with the ram during theinitial stages of the ram compression movement, and means for holdingthe outer curb in its uppermost position upon the completion cicompression, the tamping member being thereupon actuated to move the ramdownwardly below the lower end of the outer curb to thereby dischargethe residue cake between the ram and outer curb, the dischargingmovement of lthe tamping member terminating short of the adjacent endsof the plates.

6. An hydraulic press of the vertical type comprising in combination, aninner curb, a slidable, outer curb spaced from and surrounding the innercurb to form a material-receiving chamber, a collecting pan carried bythe lower end oi' the outer curb, a ram movable to compress the materialin the chamber and retractible toits initial position, the outer curbmoving with the ram during compression and the ram having passagesconnecting the pan with the interior ofthe inner curb, a sealing ringhaving sealing contact with the outer curb and ram and adapted to directthe expressed fluid into the pan, means for holding the outer curb inits shifted position, the ram moving the ring during its retractingmovement to provide a discharge opening with the adjacent end of theshifted curb, and means for discharging the residue cake through theopening.

7. An hydraulic press of the vertical type comprising in combination, aninner curb, a slidable, outer curb spaced from and surrounding the innercurb to form a material-receiving chamber, a collecting pan carried bythe lower end of the outer curb, a ram movable to compress the materialin the chamber and retractible to its initial position, the outer curbmoving with the ram during compression and the ram having passagesconnecting the pan with the interior of the innerfcurb. a sealing ringhaving sealing contact with the outer curb and ram and adapted to directthe expressed iiuid into the pan, means for maintaining contact of thering with the outer curb during its shifting movement, means for holdingthe outer curb in its shifted position, the ram moving the ring duringits retracting movement to provide a discharge opening with the adjacentend of the shifted curb, and means for discharging the residue cakethrough the opening.

8. An hydraulic press of the vertical type comprising in combination, aninner curb, a slidable outer curb spaced from and surrounding the innercurb to form a material-receiving chamber, a collecting pan carried bythe lower end of the outer curb, a ram movable to compress the materialin the chamber and retractible to its initial position, the outer curbmoving with the ram during compression and the ram having passagesconnecting the pan with the interior of the inner curb, `'a' 'sealingring' having sealing Vcontact 'with the outer'crb and ram and adapted tddirect theV expressed fluid into thepan, springs for maintain# ingcontact of the ring with the outer curb during' the latters 'shiftingmovement, means for holding the outer curb ih its shifted position, theram moving the ring during itsretracting movement to provide a dischargeopening with the adjacent end of the shifted curb, and means fordischarging the residue cake through the opening.

9; hydraulic press of the vertical type comprising inconibination, aninner curb, a slidable outer curb spaced from and surrounding the innercurb 'toform `a imaterial-receiving chamber, a collecting pan carriedbythe lower end of the outer curb, a ram normally closing the lowerendofthe chambeni said ram being movable to compress the material in thechamber and retractible to initial position vand the outer' curb movingwith the ram during compression, the ram having passages connecting thepan with the interior of the inner curb, a sealing ring having sealingcontact with the outer curb and ram and adapted to direct the expressedfluid into the pan, means for holding the outer curb in shifted positionupon the completion of the compression, the retracting movement of theram shifting the sealing ring from contact with the outer curb totherebyprovide an opening with the adjacent end of the outercurb, andmeans for discharging the residue cake through the opening.

- A10. An hydraulic press ofthe vertical typecomprising in combination,an .inner curb, a slidable outer curb spaced VVfrom and surrounding theinner curb to form a materialreceiving chamber, a colvlecting pancarried bythe lower end of the outer curb; a tamping member and a ramlocated adjacent the opposite ends Yoi? the chamber, respectively, meansfor actuating the member and ram in opposite directions at diiierenttimes to fully charge and compress the material in the chamber,respectively, the outer curb moving with the ram during compression andthe ram having passages connecting the pan with the interiorV of theinner curb, a sealing ring having sealing contact with the outer curband ram and adapted to direct the expressed uid Vinto the pan, Yandmeans for holding the outer curb in its shifted position upon thecompletion of compression, the tamping member being thereupon actuatedto move they ram Vand sealing ring to a position providing a dischargeopening withrthe outer curb through which ,the residue cake isdischarged by the continued 4movement of the tamping member.

1l. An hydraulic press ofthe vertical type comprising in combination,curb guides, an inner curb,

anoter curb freely slidable alongv` the guides 'and surrounding theinnercurb to` formV a material# receiving chamber, a. collecting pancarried by the lower endof the outer curb, va ram movable tovcompress'the'riaterial in the chamber and retractible to its initialposition, the outer`curb. moving with the ram during compression and theram having passages connecting the pan with the interior of the innercurb, a sealing ring having sealing contact with the outer curb and ramand engaged by the latter, the ring being adapted to direct theexpressed fluid into the pan, means for holding the outer curbvin itsshifted position upon' the completion of compression, the ram moving thering during its retracting movement to provide a discharge opening withthe adjacent end of the shifted curb, and means for discharging'theresidue cake through the opening, said outer curb returning by gravityto its initial position in contact with the sealingring when the holdingmeans is released.

12.V An hydraulic press ofthe vertical type comprising in combination,an inner curb, an outer curb spaced from and surrounding the inner curbto form a material-receiving chamber, a collecting pan'surrounding thelower end of the outer` curb for receiving fluid expressed therethrough,a ram movable to compress the material in the chamber and havingpassages leading from the interior of the inner curb "and terminating inthe pan for delivering iluid from the inner curb, and a member operatingas an abutment for the compressing movement of the ram..V i

13. An hydraulic press of the vertical type comprising in combination,an inner curb, a slidable, outer curb spaced from and surrounding theinner curb to forfn a material-receiving chamber, a ram movable tocompress the material inthe chamber and retractible to its initialposition, the outer curb movingwith the ram during compressiomacollecting pan composed Vof two separable parts, one part surroundingand being carried by the lower end of the outer curb and the other partbeing formed as a sealing ring having sealing contact with the outercurb and ram, the ram having passages connecting the pan with theinterior of the inner curb and the ring being adapted Vto direct the uidexpressed from the innerY curb into the pan, means for holding the outercurb in its shifted position, the ram moving'the ring during itsretracting movement to provide a discharge `opening With the adjacentend of the shifted curb, and means for discharging the residue cakethrough the opening.

LOUIS A. MOLIN.

